利用第26次中国南极科学考察期间收集的海冰密集度船基观测资料以及由Landsat-7 ETM+得到的海冰密集度来验证AMSR-E南极海冰区海冰密集度产品的精度。AMSR-E海冰密集度与船基目视观测的海冰密集度存在着一定的线性关系(R²=0.816), 但两者匹配得并不是很好。与ETM+海冰密集度相比,AMSR-E数据趋向于低估海冰密集度,在25景晴空条件下的ETM+影像中,平均海冰密集度偏差(AMSR-E海冰密集度-ETM+海冰密集度)从-5.33%到-21.5%,而相应的均方根误差RMSE (Root Mean Squared Errors)从13.7%到33.8%。依据Landsat-7 ETM+ 海冰分类,AMSR-E数据海冰密集度最大的误差产生于新冰区。

The purpose of this research is to assess the accuracy of sea ice concentrations derived from AMSR-E data using ship observations from the 26^th Chinese National Antarctic Research Expedition (CHINARE) and Landsat-7 ETM+ Imagery in Antarctic. The comparison of AMSR-E sea ice concentrations with ship observational data indicated a general linear relationship between the two types of observations (R² = 0.816), but two types of data didn't match each other quite well. AMSR-E tended to underestimate sea ice concentrations (compared to ETM+ ice concentrations), with average ice concentration biases ranging from -5.33% to -21.5% and corresponding Root Mean Square Errors (RMSEs) ranging from 13.7% to 33.8%. For the Landsat-7 ETM+ sea ice type classification, the largest errors occurred in areas of new ice; in such areas, new ice was recognized as seawater by AMSR-E owing to its emission of passive microwave radiation, which is different to that emitted from other first-year ice.